Adjust MemFs.List() to return the data

memmap.go

@@ -14,13 +14,10 @@
 package afero
 
 import (
-	"fmt"
 	"io"
-
 	"log"
 	"os"
 	"path/filepath"
-
 	"sort"
 	"strings"
 	"sync"
@@ -457,9 +454,11 @@ func (m *MemMapFs) Chtimes(name string, atime time.Time, mtime time.Time) error
 	return nil
 }
 
-func (m *MemMapFs) List() {
-	for _, x := range m.data {
-		y := mem.FileInfo{FileData: x}
-		fmt.Println(x.Name(), y.Size())
+func (m *MemMapFs) List() map[string]*mem.FileInfo {
+	files := make(map[string]*mem.FileInfo)
+	for _, f := range m.data {
+		files[f.Name()] = mem.GetFileInfo(f)
 	}
+
+	return files
 }

memmap_test.go

@@ -6,7 +6,9 @@ import (
 	"io/fs"
 	"os"
 	"path/filepath"
+	"reflect"
 	"runtime"
+	"sort"
 	"strings"
 	"sync"
 	"testing"
@@ -918,3 +920,37 @@ func TestMemMapFsRename(t *testing.T) {
 		}
 	}
 }
+
+func TestMemFsList(t *testing.T) {
+	t.Parallel()
+
+	fs := NewMemMapFs()
+
+	if err := WriteFile(fs, "file.txt", []byte("abc"), 0777); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := WriteFile(fs, "another/file.txt", []byte("abc"), 0777); err != nil {
+		t.Fatal(err)
+	}
+
+	files := fs.(*MemMapFs).List()
+	if len(files) != 4 {
+		t.Fatalf("Expected 4 files, got %d", len(files))
+	}
+
+	filenames := make([]string, 0, 4)
+	for file, _ := range files {
+		filenames = append(filenames, file)
+	}
+
+	sort.Strings(filenames)
+	if !reflect.DeepEqual(filenames, []string{
+		string(os.PathSeparator),
+		"another",
+		"another" + string(os.PathSeparator) + "file.txt",
+		"file.txt",
+	}) {
+		t.Fatalf("Expected different files, got: %s", filenames)
+	}
+}